I've recently been diagnosed with pernicious anaemia after a low B12 blood test result, and then also testing positive for anti intrinsic factor antibodies. I was then given 6 loading doses of B12 which finished on the 24th March. I seem to be now having the same symptoms as last time, dizzyness, exhaustion, headaches being the main problems. I went to the Dr yesterday, who said that pernicious anaemia is a slow progressing disease, and my symptoms can't possibly be because of that. She then stated that the symptoms that originally brought around the diagnosis were also not due to pernicious anaemia because they also came on relatively quickly (I went from feeling unwell like with a virus to fainting and being unable to control falling asleep and hearing my heartbeat in my head within a month). She also said that as I was not anaemic originally (only with low B12), that it would not have caused any symptoms (and wasn't I lucky they had caught it early before it caused any symptoms!). She had no suggestions as to what is actually causing these symptoms, and started asking the classic GP fobbing off of 'are you under any stress at home or at work' questions. I found the fainting really scary, and don't want to have to get to that stage again before they will agree that there is something wrong that they need to treat.
So my question is really whether anyone else has experienced quick onset of symptoms? I'm also a really active person, and after the loading doses went back to cycling 16 miles commuting to work, going to the climbing wall, doing yoga, walking the dog, playing with my 15 month old son etc, so I'm thinking that I might have a higher B12 requirement than the average patient (who the leaflet they gave me said was over 60!). I also had a virus recently (toddlers seem to be endless suppliers of these!) which may have depleted B12 also?